Big Horn 19541 9-piece 1/2-Inch dia by 3-Inch replacement sleeves are designed to be used with Big Horn 19540 9-Piece Super Long Sanding Drum Set, sold separately. All sanding drum kits feature aluminum oxide resin bond spiral no-lap sleeves. Self expanding rubber cushioned drums have 1/4" shank. Excellent for sanding holes, edges, contours, irregular shapes and wider surfaces. Each set includes 1 set of replacement sleeves.